Plastic blank

ABSTRACT

A plastic blank includes a blank structure. The blank structure includes an elongate body portion and a head portion. One of two ends of the body portion is closed, and the head portion is connected to the other end of the body portion. The body portion has a space therein. The head portion has an opening communicating with the space. The outer periphery of the body portion is even so that a stick having product labelling can be attached onto the outer periphery of the body portion. The inner periphery of the body portion has a plurality of ribs protruded inward the space and extending along the body portion to improve the structural strength of the body portion along the length direction.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a plastic blank, in particular to aplastic blank for blow molding.

Description of the Prior Art

A shown in FIG. 9, the head portion 911 of a conventional plastic blank9 is fixed and the body portion 912 of the plastic blank 9 project intoa mold 92. After blow molding and cooling procedures, the plastic blank9 becomes a bottle 93, as shown in FIG. 10. The outer peripheral surface931 of the bottle 93 is uneven because the profile of the cavity 921 ofthe mold 92 is uneven. The protruded portions of the outer peripheralsurface 931 form transverse annular ribs 932 which improve thestructural strength of the bottle 93 along its width direction. Afterthe bottle 93 is formed, a stick having the product labelling (notshown) is attached onto the outer peripheral surface 931 of the bottle93, and commonly the stick is attached on a relative flat portion of thebottle 93 or attached around the outer peripheral surface 931 of thebottle 93.

The outer peripheral surface 931 of the bottle 93 blow-molded by theconventional blank 9 is uneven. Therefore, the stick is attached on theprotruded portions of the outer peripheral surface 931 of the bottle 93and is not attached on the recessed portions of the outer peripheralsurface 931 of the bottle 93. Accordingly, the stick cannot be firmlyattached onto the bottle 93 and would be detached from the bottle 93easily.

In addition, the annular ribs 932 can improve the structural strengthalong the width direction of the bottle 93 but not the length directionof the bottle 93. Therefore, when the bottle 93 is pressed, the bottle93 would deform easily along its length direction.

SUMMARY OF THE INVENTION

One object of the present invention is to solve the aforementionedproblems and to provide a plastic blank. A bottle produced by theplastic blank has an even surface, so that a stick having productlabelling can be smoothly attached onto the surface of the bottle, andthe stick would not detach from the bottle easily. In addition, the ribsformed in the plastic blank improve the structural strength inlongitudinal direction of the bottle, so that the bottle would notdeform easily when being pressed.

To achieve the above and other objects, a plastic blank is provided andcomprises a hollowed blank structure. The blank structure comprises abody portion and a head portion. The body portion is elongate shaped.One of two ends of the body portion is closed and the head portion isconnected to the other end of the body portion. The body portion definesa space therein. The head portion has an opening communicating with thespace. The outer periphery of the body portion is an even surface, andthe inner periphery of the body portion has a plurality of ribs eachprotruded inward the space and extending along the body portion.

Wherein, each of the ribs is linearly extending at the inner peripheryof the body portion along the length direction of the body portion, eachof the ribs is equally spaced from adjacent ribs, and the ribs areannularly aligned over the body portion.

Wherein, each of the ribs is inclinedly extending at the inner peripheryof the body portion with respect to the length direction of the bodyportion.

Wherein, the extension length of each of the ribs is equal to the lengthof the body portion.

Wherein, the extension length of each of the ribs is less than thelength of the body portion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a perspective view of a blank according to a firstembodiment of the present invention;

FIG. 2 illustrates a top view of the blank according to the firstembodiment of the present invention;

FIG. 3 illustrates a sectional view showing the blank of the firstembodiment is positioned in a mold;

FIG. 4 illustrates a sectional view showing the blank of the firstembodiment is blow-molded in the mold to form a bottle;

FIG. 5 illustrates a sectional view showing the blank of the firstembodiment is blow-molded in a mold shown in FIGS. 9 and 10 to form abottle;

FIG. 6 illustrates a perspective view of a blank according to a secondembodiment of the present invention;

FIG. 7 illustrates a top view of the blank according to the secondembodiment of the present invention;

FIG. 8 illustrates a sectional view showing the blank of the secondembodiment is positioned in a mold;

FIG. 9 illustrates a sectional view showing a conventional blank ispositioned in a mold; and

FIG. 10 illustrates a sectional view showing the conventional blank isblow-molded in the mold to form a bottle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 to 8, which illustrate a plastic blank accordingto embodiments of the present invention. The embodiments are providedfor illustrative purposes only and not formed as limitations of thepresent invention.

In the first embodiment, a plastic blank is provided, as shown in FIGS.1 and 2. The plastic blank comprises a hollowed blank structure 1. Theblank structure 1 comprises a body portion 11 and a head portion 12. Thebody portion 11 is elongate shaped. One of two ends of the body portion11 is closed and the head portion 12 is connected to the other end ofthe body portion 11. The body portion 11 defines a space 13 therein. Thehead portion 12 has an opening 14 communicating with the space 13. Theouter periphery 111 of the body portion 11 is even. The inner periphery112 of the body portion 11 has a plurality of ribs 15 each protrudedinward the space 13 and extending along the body portion 11.

In addition, in this embodiment, each of the ribs 15 is linearlyextending at the inner periphery 112 along the length direction of thebody portion 11, and each of the ribs 15 is equally spaced from adjacentribs 15, the ribs 15 are annularly aligned over the body portion 11, andthe extension length of each of the ribs 15 is equal to the length ofthe body portion 11.

As shown in FIGS. 3 and 4, in this embodiment, when the blank structure1 is blow-molded in a mold 2, the head portion 12 of the blank structure1 is positioned and the body portion 11 of the blank structure 1 projectinto a cavity 21 of the mold 2. Therefore, when blow molding techniqueis applied to the blank structure 1, the body portion 11 of the blankstructure 1 is fitted with the cavity 21 of the mold 2 and a bottle 3can be produced. The outer periphery of the bottle 3 corresponds to theinner profile of the cavity 21 and is an even surface 31, and the ribs15 are blow-molded to form longitudinal rib structures 32 in the bottle3. Accordingly, because the surface 31 of the bottle 3 is uniform andnot uneven, a stick having product labelling can be smoothly attachedonto the surface 31 of the bottle 3. In addition, because of theformation of the longitudinal rib structures 32, the structural strengthalong the length direction of the bottle 3 is improved, and the bottle 3would not deform easily when the bottle 3 is pressed.

Alternatively, as shown in FIG. 5, the blank structure 1 can also beblow-molded in a conventional mold 92 to form a bottle 4. Accordingly,not only the surface 41 of the bottle 4 is uneven so as to improve thestructural strength of the bottle 4 along its width direction, but alsothe bottle 4 has the longitudinal rib structures 42 therein so as toimprove the structural strength of the bottle 4 along its lengthdirection. Hence, when the bottle 4 is pressed, the bottle 4 would notdeform easily.

The present invention may have other embodiments which are variationstherebetween. Please refer to FIGS. 6 and 7, which illustrate a secondembodiment of the present invention. The blank structure 5 alsocomprises a body portion 51 and a head portion 52. The body portion 51has a space 53 therein. The head portion 52 has an opening 54. The outerperiphery 511 of the body portion 51 is even. In this embodiment, eachof the ribs 55 is inclinedly extending at the inner periphery 512 of thebody portion 51 with respect to the length direction of the body portion51, and the extension length of each of the ribs 55 is less than thelength of the body portion 51. As shown in FIG. 8, a bottle 6 formed bythe blank structure 5 of the second embodiment also has an even surface51 and the bottle 6 further has a plurality of reinforce ribs 62 formedby the ribs 55. although the reinforce ribs 62 are shorter than the bodyportion 51, a better structural strength along the length direction ofthe body portion 51 can be provided as compared with a bottle formed bythe conventional blank. In addition, a stick having product labellingcan also be smoothly attached on the surface 61 of the bottle 6 of thesecond embodiment.

What is claimed is:
 1. A plastic blank comprising a hollowed blank structure, wherein the blank structure comprises a body portion and a head portion, the body portion is elongate shaped, one of two ends of the body portion is closed and the head portion is connected to the other end of the body portion, the body portion defines a space therein, the head portion has an opening communicating with the space, the outer periphery of the body portion is an even surface, and the inner periphery of the body portion has a plurality of ribs, each of the ribs is protruded inward the space and extending along the body portion.
 2. The plastic blank according to claim 1, wherein each of the ribs is linearly extending at the inner periphery of the body portion along the length direction of the body portion, each of the ribs is equally spaced from adjacent ribs, and the ribs are annularly aligned over the body portion.
 3. The plastic blank according to claim 1, wherein each of the ribs is inclinedly extending at the inner periphery of the body portion with respect to the length direction of the body portion.
 4. The plastic blank according to claim 1, wherein the extension length of each of the ribs is equal to the length of the body portion.
 5. The plastic blank according to claim 1, wherein the extension length of each of the ribs is less than the length of the body portion. 